High-Yield Construction Hazard Control Tables
Key Takeaways
- High-yield review connects hazards, exposures, controls, and the verification evidence that proves control.
- The hierarchy of controls (elimination, substitution, engineering, administrative, PPE) is the fastest answer filter.
- Construction questions often test recognition of changing conditions, not static definitions.
- OSHA construction triggers (6-foot fall protection, trench protection at 5 feet, 50 micrograms-per-cubic-meter silica PEL) are high-yield anchors.
- A CHST should choose controls that are feasible, timely, and stronger than warning-only responses.
High-Yield Construction Hazard Control Tables
How To Use The Tables
A final-review table should do more than list hazards. It should connect the hazard to the exposure, the preferred control, and the evidence that the control is working. CHST questions often place you in field conditions where several facts are true at once: the crew is behind schedule, weather changed, the subcontractor is new, a permit exists, and a worker is exposed anyway. In that setting, the best answer is usually the one that controls the exposure now and improves the system afterward.
Core Hazard Controls With OSHA Triggers
| Hazard area | Key OSHA trigger (29 CFR 1926) | Stronger controls | Weak answer pattern |
|---|---|---|---|
| Falls | Fall protection at 6 ft in construction (Subpart M) | Guardrails, hole covers, personal fall arrest system (PFAS), platform selection, inspection | Tell workers to be careful |
| Excavation | Protective system required at 5 ft (Subpart P) | Sloping/shoring/shielding, competent person daily inspection, safe egress within 25 ft, spoil 2 ft from edge | Enter quickly to finish |
| Electrical | GFCI or assured grounding on temp power (Subpart K) | De-energize, lockout/tagout, GFCI, inspect cords, qualified repair | Tape damaged cords and continue |
| Struck-by | High-visibility apparel, traffic control (Subpart G/O) | Exclusion zones, spotters, internal traffic control plan, lift plans | Rely only on backup alarms |
| Caught-in | Machine guarding, energy control (Subpart O) | Fixed guards, lockout, blocking, barricades | Remove guards for speed |
| Respirable crystalline silica | PEL 50 micrograms-per-cubic-meter, action level 25 (1926.1153) | Substitute, wet methods, local exhaust ventilation, Table 1 controls, respirators, monitoring | Give PPE without assessment |
Hierarchy Of Controls Under Pressure
Use the hierarchy as your answer filter: elimination, substitution, engineering controls, administrative controls, PPE. Elimination and engineering controls outrank training-only or PPE-only choices when the question asks for the best long-term control. Administrative controls still matter, especially permits, inspections, competent-person review, pre-task planning, exposure rotation, and access control, but they should never excuse a missing physical control.
A common trap is a familiar but incomplete answer. A toolbox talk may help after repeated ladder misuse, but if the stem says a ladder is damaged, the immediate best action is to remove it from service. A written hot-work permit may be required, but it does not replace fire watch, combustible control, extinguisher readiness, and post-work monitoring when the situation needs them.
Changing Conditions Table
| Condition changed | CHST concern | Best review question |
|---|---|---|
| Rain after excavation inspection | Soil stability, water accumulation | Has the competent person reinspected before entry? |
| New subcontractor arrives | Orientation, site-specific hazards | Did workers receive current instructions? |
| Crane path changes | Swing radius, ground bearing, power lines (20 ft for under 350 kV) | Was the lift plan or exclusion zone updated? |
| Heat index rises | Heat illness prevention | Are water, rest, shade, and acclimatization addressed? |
| Work moves indoors | Ventilation, evacuation | Are fumes, noise, access, and alarms controlled? |
Documentation That Supports Control
Good records prove a control was planned, communicated, inspected, and corrected: job hazard analyses (JHAs), pre-task plans, inspection forms, permits, exposure monitoring, training records, incident reports, corrective-action logs, equipment inspections, and safety data sheet (SDS) access. When the exam asks what to review after a trend appears, choose the document that reveals the source of risk and whether controls were maintained.
Worked Hazard Scenario
Walk one scenario the way the exam frames it. A crew cuts concrete with a gas-powered handheld saw indoors after a schedule change moved the work inside. Dust is visible, the area is poorly ventilated, and two workers wear no respirators. The weak answer hands out dust masks and continues. The strong answer applies the silica standard's hierarchy: first reduce dust at the source with wet cutting or an integrated water-feed and a vacuum dust collector (engineering controls), then add ventilation, and only then assign appropriate respiratory protection while exposures remain above the action level. Verification follows: confirm wet methods are running, check that the vacuum filter is rated and maintained, and use air monitoring to compare exposure against the 50-microgram-per-cubic-meter permissible exposure limit. Notice the order: controls before paperwork, source before PPE, and verification before declaring the problem solved.
Reading The Trap Answers
Hazard items are built so one answer is technically true but incomplete, and the trap is choosing it. Common trap shapes include: a control that is real but lower in the hierarchy than a feasible stronger one; an administrative fix offered while an active physical exposure goes uncontrolled; a step that is correct but out of sequence (PPE before engineering controls); and a confident-sounding action that exceeds the CHST role, such as authorizing a structural repair. When you spot two answers that both "work," ask which one controls the exposure at the highest feasible level and which one a safety auditor would defend. That comparison, not familiarity with the wording, is what the one-best-answer format is testing.
Final Drill
For each hazard missed in practice, write one line: hazard, exposure, best control, verification. Example: silica cutting, respirable dust, wet method plus local exhaust ventilation with respirators as needed, verify by observation and exposure monitoring against the 50-microgram PEL. This habit turns memorized words into defensible field decisions, and reviewing the list daily keeps the strongest control top of mind for the largest-weight domain.
A worker is about to use a portable ladder with a cracked side rail. What is the best CHST response?
Which control generally ranks highest in the hierarchy of controls?
Heavy rain occurs overnight at an active trench that was inspected the prior afternoon. Which question should drive the morning entry decision?